X-Nico

Curie constant

where $N$ is the number of magnetic atoms (or molecules) per unit volume, $g$ is the Landé g-factor, $\backslash mu\; B$ (9.27400915e-24 J/T or A·m²) is the Bohr magneton, $J$ is the angular momentum quantum number and $k\; B$ is Boltzmann's constant.

see also

Angular momentum coupling

Or two charged particles, each with a well-defined angular momentum, may interact by Coulomb forces, in which case coupling of the two one-particle angular momenta to a total angular momentum is a useful step in the solution of the two-particle Schrödinger equation.

Good quantum number

In the case of the hydrogen atom (with the assumption that there is no spin-orbit coupling), the observables that commute with Hamiltonian are the orbital angular momentum, spin angular momentum, the sum of the spin angular momentum and orbital angular momentum, and the $z$ components of the above angular momenta.

Spin magnetic moment

The idea of a spin angular momentum was first proposed in a 1925 publication by George Uhlenbeck and Samuel Goudsmit to explain hyperfine splitting in atomic spectra.

Wigner–Eckart theorem

The name derives from physicists Eugene Wigner and Carl Eckart who developed the formalism as a link between the symmetry transformation groups of space (applied to the Schrödinger equations) and the laws of conservation of energy, momentum, and angular momentum.